Unite the host key(host, host_name)

[tinytmy]

It used host_name key in
https://github.com/openstack/nova/blob/master/nova/api/openstack/compute/contrib/hosts.py#L40
used host key in
https://github.com/openstack/nova/blob/master/nova/api/openstack/compute/contrib/hosts.py#L266-L267
Why not unite the key.

And this lead to novaclient bug such as:
>>> from novaclient.v1_1 import client
>>> nc = client.Client("admin","password","admin","http://192.168.1.100:5000/v2.0")
>>> nc.hosts.get("controller")
[<Host: controller>, <Host: controller>, <Host: controller>, <Host: controller>]

>>> nc.hosts.list()
[Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/dist-packages/novaclient/v1_1/hosts.py", line 24, in __repr__
    return "<Host: %s>" % self.host
  File "/usr/lib/python2.7/dist-packages/novaclient/openstack/common/apiclient/base.py", line 489, in __getattr__
    raise AttributeError(k)
AttributeError: host

-----------------------------------
Maybe some people think it is the novaclient bug.
In this patch https://review.openstack.org/#/c/110087/,
it fix the hosts.get(), but lead to hosts.list() cann't work.
Maybe we can add some judge such as(if .eg) in the function of
https://github.com/openstack/python-novaclient/blob/master/novaclient/v1_1/hosts.py#L24,
but I think unite the key to 'host' in nova is much better, if such we don't need to change novaclient and nova code looks better.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/152416

[Ghanshyam Mann (ghanshyammann)]

So this is backward incompatible change for Nova. I think, It needs to go through micro-version without breaking V2 API compatibility .

Currently Tempest do not tests API micro-version (as there is no candidate till now) if proposed nova changes is accepted for micro-version then we need to decide how to test microversion in tempest.

Current tempest tests are right/valid to maintain the backward compatibility of Nova API.

[Ghanshyam Mann (ghanshyammann)]

Marking incomplete for tempest till it is decided in Nova first.

[OpenStack Infra (hudson-openstack)]

Change abandoned by Joe Gordon (<email address hidden>) on branch: master
Review: https://review.openstack.org/152416
Reason: This review is > 4 weeks without comment, and failed Jenkins the last time it was checked. We are abandoning this for now. Feel free to reactivate the review by pressing the restore button and leaving a 'recheck' comment to get fresh test results.

[Ken'ichi Ohmichi (oomichi)]

Nova team has decided the corresponding patch is not necessary, so we don't need to fix this also on Tempest side because of non-activity in long-term also.